AIDS-006601 AIDS006601 Cbz-Thr Imid HOEt isostere [2-Hydroxy-1-[[[2-hydroxy-4-[4-(1-methylethyl)-1H-imidazol-2-yl]-5-phenyl-1-(phenylmethyl)pentyl]amino]carbonyl]propyl]carbamic acid, [1S-[1R*(R*),2R*,4S*]]